a widespread body of air, the properties of which can be identified as: (a) having been established while that air was situated over a particular region of the Earth's surface (airmass source region) and (b) undergoing specific modifications while in transit away from the source region. An air mass is often defined as a widespread body of air that is approximatelyhomogeneous in its horizontal extent, particularly with reference to temperature and moisturedistribution; in addition, the vertical temperature and moisture variations are approximately the same over its horizontal extent.
The amount of air through which light from a celestial object passes, normalized to 1 for an object at zenith.
Origin
air + mass
Modern English dictionary
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